Ok, I probably don't look like it but I used to compete in bench press competitions in college. When we reached plateaus we would work out with negative sets for about a week. If you're not familiar with them - basically you need to get in a cage rack and use whatever weight you believe your max to be. You'll need at least 2 spotters (3 is better) and have your spotters give you the weight at full extension, with you controlling the weight as slowly as possible on the way down - repeating 3-5 times.
If that doesn't work, give it a rest for a week or two then go at it again.
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